Morphometric and ultrasonographic study of the human fetal hip joint during intrauterine development

Vol. 54 No. 4, 2013

ROMANIAN JOURNAL of MORPHOLOGY and EMBRYOLOGY

Beata Baroti, Zsuzsanna Pap, Z. Panti, M. M. Buruian, Z. Pavai

The main method for the early screening of the developmental dysplasia of the hip (DDH) is the ultrasound imaging. There are several studies about the ultrasound imaging of newborns' hips, but only a few studies include the prenatal period of life. Our aim was to examine the prenatal development of the hip joint through the evolution of the alpha angle seen on the ultrasound, described in the Graf R method, combined with anatomical dissection. Materials and Methods: Thirty-one post-mortem fetal hips were analyzed trough anatomical dissection, in 25 cases trough ultrasound imaging, in which the alpha angle was measured. Based on the morphometric examination, we applied the sine rule and we calculated the alpha1 angle, which also represents the coverage of the femoral head. Results: Based on the morphometric examination, not only the diameters of the femoral head and of the acetabulum, but also the joint cavity (X) showed an increase during development. Both of the alpha angles (measured alpha, calculated alpha1) showed a decrease as the fetus developed. Conclusions: The decrease of the angles (alpha, alpha1) and the increase of the joint cavity during development correspond to the findings of the main research papers: the hip joint is less stable in the perinatal life. The alpha angle can be accurately determined only after the ossification of the acetabulum had started, in our case after the fetus is older than 18 weeks.

Corresponding author: Zsombor Panti, Student, General Medicine 6th year; e-mail: panti.zsombor@gmail.com

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